杭白芷根的分泌道超微结构与其挥发油分泌的关系

利用光镜及透射电子显微镜技术研究了杭白芷根中分泌道结构及其挥发油的分泌,并重点探讨分泌道中挥发油的分泌过程。结果显示:(1)杭白芷的分泌道是由上皮细胞围绕着的伸长的胞间隙,腔道内贮存着挥发油。(2)分泌道细胞的质体、细胞基质以及线粒体参与挥发油或其前体物质的合成。(3)在分泌道发育的后期,大量小泡与分泌细胞的液泡膜和细胞质膜融合,将其内的物质释放进入空腔。研究认为,杭白芷分泌道中挥发油主要合成部位为质体及细胞基质,之后以扩散渗透或通过膜质小泡与液泡及质膜融合这两种方式分泌到空腔内,丰富的线粒体可能为这一系列过程提供能量。

Relationship between Ultrastructure and Secretion of Secretory Canals in Root of Angelica dahurica

The ultrastructure of secretory canals in root of Angelica dahurica and the accumulation of essential oils were investigated by transmission electron microscopy (TEM) analysis.The secretion process of the essential oil was also discussed.The results indicate that the plastid,ground substances of cytoplasm and mitochondria took part in the biosynthesis of oil or oil precursor.At latter stages of development of secretory cells,numerous different sized vesicles fused with the plasmalemma and tonoplast and released the inner materia into the lumen of secretory canals.As a result,plastid and ground substances of cytoplasm were the major synthetic site of volatile oil which secreted into the lumen by diffusion or by vesicles fusing with the plasmalemma and tonoplast.Abundant mitochondria may provide energy for the series of process.